init+contexte : am init genere un agent-manager.yaml selon la stack detectee + contexte projet (git root, branche, stack) attache aux evenements et sessions (issue #8)

src/commands/init_cmd.rs

@@ -0,0 +1,70 @@
+//! init: generate a local agent-manager.yaml for the current directory,
+//! based on the detected technology stack.
+
+use super::*;
+use crate::context;
+use anyhow::{anyhow, Context, Result};
+use std::path::{Path, PathBuf};
+
+/// Generate a local config file in dir; refuses to overwrite unless force.
+/// Returns the written path.
+pub fn generate(dir: &Path, force: bool) -> Result<PathBuf> {
+    let target = dir.join(crate::config::LOCAL_CONFIG_NAME);
+    if target.exists() && !force {
+        return Err(anyhow!(
+            "{} already exists — use --force to overwrite it",
+            target.display()
+        ));
+    }
+    let ctx = context::detect(dir);
+    let agents = context::recommended_agents(&ctx.stack);
+    let members = agents
+        .iter()
+        .map(|a| a.to_string())
+        .collect::<Vec<_>>()
+        .join(", ");
+    let stack = if ctx.stack.is_empty() {
+        "aucune détectée".to_string()
+    } else {
+        ctx.stack.join(", ")
+    };
+    let content = format!(
+        "# Généré par 'am init' le {date}
+# Pile détectée : {stack}
+version: \"1.0\"
+groups:
+  dev: [{members}]
+agents: []
+",
+        date = crate::installers::now_rfc3339(),
+    );
+    std::fs::write(&target, content)
+        .with_context(|| format!("cannot write {}", target.display()))?;
+    Ok(target)
+}
+
+pub fn run(app: &App, force: bool) -> Result<i32> {
+    if app.dry_run() {
+        app.log.dry(format!(
+            "would generate {} in the current directory",
+            crate::config::LOCAL_CONFIG_NAME
+        ));
+        return Ok(0);
+    }
+    let cwd = std::env::current_dir().context("cannot determine the current directory")?;
+    let ctx = context::detect(&cwd);
+    let path = generate(&cwd, force)?;
+    app.log.success(&format!(
+        "wrote {} (stack: {})",
+        path.display(),
+        if ctx.stack.is_empty() {
+            "aucune détectée".to_string()
+        } else {
+            ctx.stack.join(", ")
+        }
+    ));
+    app.log.info(&format!(
+        "group 'dev' prêt : am start group:dev — ajustez ensuite la config générée"
+    ));
+    Ok(0)
+}